US-CERT has received multiple reports of Bad Rabbit ransomware infections in many countries around the world. This suspected variant of Petya ransomware is malicious software that infects a computer and restricts user access to the infected machine until a ransom is paid to unlock it. US-CERT discourages individuals and organizations from paying the ransom, as this does not guarantee that access will be restored. Using unpatched and unsupported software may increase the risk of proliferation of cybersecurity threats, such as ransomware.

Systems Affected

Mozilla has released a security update to address multiple vulnerabilities in Thunderbird. Exploitation of some of these vulnerabilities may allow a remote attacker to take control of an affected system.